Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2719637c53d607…

MALICIOUS

PDF

87.3 KB Created: 2021-04-08 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f8f74c30275acd18cfcbe7aef2e5a17d SHA-1: e950ca567e773df849368785bb677994984ed59e SHA-256: 9f2719637c53d6077171a0da9ec15a020f8cec0ef08846c3f8009877693527c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being associated with a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=js+map+vs+foreach+performance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fd8919158739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_6064edf4496d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5fec978925264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_603df37482662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_60189f66000a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_602336951c6cb.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/samsung_rugby_2_sim_card_size.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/1a1fc8707698.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/wegopik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_6040fd1cbb70f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_5fd897bebd120.pdfIn PDF document text
    • http://janizejekifajab.medianewsonline.com/bradford_assay_protocol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gudukupir/fagad.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/ugc_net_sociology_syllabus_2019.pdfIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_982412011764471f9072eda16a4b43c4.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_3fac1758e3564f3393df756a6622ab6f.pdf?index=trueIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/priority_table_of_functional_groups.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_281831c16f2142538d6b9a8c6094c259.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 4932 bytes
SHA-256: 8757d9617f096657f97b402adbeeff5dfa6cf02cf6321401c38143bb292fc881
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 3120 bytes
SHA-256: 6aa82955e117d44a43ee3f00d38721e5a856e0beaa5e9be21e4b15ad85f5f80c
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 11596 bytes
SHA-256: 2db4ea577858d2303d6cbc935f2781f33641c8d2c56bd87cb51591784b073a49
font_03_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 16076 bytes
SHA-256: 007377d672ad35e960bd13d3f92b574e68300ebd174b34df27fa78aa6545cdcd
font_04_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361